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A short guide to currents in circuits. It answers what is current and how do we measure it.
Circuit currents and voltages in AC circuits are generally stated as root-mean-square or rms values rather than by quoting the maximum values. The root-mean-square for a current is calculated by ...
A demonstration of electric currents in a DC circuit
Magnetic fields are produced by electric currents, which can be macroscopic currents in wires, or microscopic currents associated with electrons in atomic orbits. The magnetic field B is defined in ...
A useful collection of posters from the Institute of Electrical Engineers that cover the electrical symbols and other circuit information.
A useful animation to demonstrate the free electron model of current flow, showing electrical resistance in the copper wire of a lightbulb.
Introductory level page on electromagnetic induction - the process of generating electrical current in a conductor by placing the conductor in a changing magnetic field.
Electric motors involve rotating coils of wire which are driven by the magnetic force exerted by a magnetic field on an electric current. They transform electrical energy into mechanical energy.
A good explanation of electrical resistance, why it exists and the variables that affect it including wire length, width and material.
The electric current in amperes which flows into any junction in an electric circuit is equal to the current which flows out. This can be seen to be just a statement of conservation of charge.
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